Published November 20, 2023
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Two-headed parthenogenetic lizard embryo from southern Georgia
Authors/Creators
- 1. Ilia State University, Tbilisi, Georgia
- 2. Universitätsmedizin Göttingen, Göttingen, Germany
- 3. Leibniz Institute for the Analysis of Biodiversity Change (LIB), Bonn, Germany
Description
Abstract
Visual inspection of several embryos of the parthenogenetic lizard Darevskia armeniaca revealed the presence of an embryo with axial bifurcation ("two-headed") on the stage of pigmented eyes and plate-like limb buds with a distinct border at the edges. This is the third recorded case of axial bifurcation in D. armeniaca, although two previous cases were mentioned without further discussion. Here the bicephalic embryo is described in detail and the potential reasons are discussed. The analysis of the literature on axial bifurcation in lacertids suggests that this type of developmental disorder may be particularly common in this parthenogenetic form. Hybridization may cause multiple developmental disorders, including incomplete separation of twin embryos; all parthenogenetic Darevskia have a hybrid origin, and this may cause the disorders rather than parthenogenetic reproduction by itself. The hypothesis needs further study with more representative samples of parthenogenetic and sexually reproducing Darevskia.
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